Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #7087

Re: A question about a few variables in a class

Show all headers | View raw

On Aug 6, 4:56 am, Eric Sosman <esos...@ieee-dot-org.invalid> wrote:
> On 8/5/2011 5:31 PM, Chad wrote:
>
>
>
>
>
> > Let's say I have the following class.....
>
> > public class ComparableRectangle extends Rectangle implements
> > Comparable {
> >    public ComparableRectangle(double width, double height) {
> >      super(width, height);
> >    }
>
> >    public int compareTo(Object o) {
> >      if (getArea()>  ((ComparableRectangle)o).getArea())
> >        return 1;
> >      else if (getArea()<  ((ComparableRectangle)o).getArea())
> >        return -1;
> >      else
> >        return 0;
> >    }
> > }
>
> > Are 'width' and 'height' data fields in this class? My initial guess
> > is yes. However, the fact that they are passed to super() makes me
> > wonder otherwise.
>
>      Looking only at the snippet shown, it's impossible to answer
> the question.  The ComparableRectangle class itself has no members
> named width or height.  It might (or might not) inherit such
> members from Rectangle or from a superclass of Rectangle.  All we
> can be sure of is (1) Rectangle has a constructor taking two
> double arguments, and (2) Rectangle or a Rectangle ancestor has
> a getArea() method returning a primitive number of some kind.
>
>      We don't actually know what Rectangle is because there are no
> import statements to tell us what package it's in.  It clearly
> cannot be java.awt.Rectangle, which has public width and height
> members but which has no getArea() and no suitable constructor.
>


Aye. I broke away from my own personal rule of posting code snippets.
I should know better since it really annoys me when people post code
snippets on comp.lang.c, and then, like magic, expect the group to be
able to magically interpet their line of thought.


Chad

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-05 14:31 -0700
  Re: A question about a few variables in a class markspace <-@.> - 2011-08-05 14:46 -0700
  Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-06 07:56 -0400
    Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-13 10:30 -0700
      Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-13 20:49 -0400
        Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-14 13:23 -0700
          Re: A question about a few variables in a class markspace <-@.> - 2011-08-14 13:52 -0700
            Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-14 22:50 -0700
          Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 18:04 -0400
            Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-14 17:09 -0700
              Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 21:57 -0400
              Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-14 22:55 -0700
          Re: A question about a few variables in a class Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-14 18:01 -0400
  Re: A question about a few variables in a class Roedy Green <see_website@mindprod.com.invalid> - 2011-08-06 22:58 -0700
    Re: A question about a few variables in a class Patricia Shanahan <pats@acm.org> - 2011-08-07 05:28 -0700
  Re: A question about a few variables in a class Lew <lewbloch@gmail.com> - 2011-08-10 09:14 -0700
    Re: A question about a few variables in a class Chad <cdalten@gmail.com> - 2011-08-13 10:27 -0700
  Re: A question about a few variables in a class Patricia Shanahan <pats@acm.org> - 2011-08-14 18:36 -0700

csiph-web